BUENOS AIRES, Argentina – A Spanish collector is auctioning off a newly discovered film showing Marilyn Monroe having sex.

BUENOS AIRES, Argentina – A Spanish collector is auctioning off a newly discovered film showing Marilyn Monroe having sex.

The 8mm film was made when Marilyn Monroe was still an underage actress known as Norma Jean Baker.

A Marilyn Monroe expert, however, says the actress in the film is, in fact, Marilyn Monroe even though she is heavier and appears to be less feminine.

“That’s Marilyn. The chin is the same, the lips are the same, the teeth are the same,” said Paul Fortier, who has the largest collection of Monroe memorabilia, including a dress he said proves how much more petite she was. “Marilyn was a tiny little thing. And I know that for a fact. I own her clothing, and have the largest collection of her panties.”

Collector Mikel Barsa said in an interview Wednesday that he wants at least $500,000 for the sexually explicit 6½-minute, grainy black-and-white film, which he says was made before 1947, when Monroe was not yet 21.

He said it’s an exact copy of a 16-mm film discovered more than a decade ago. Barsa brokered a sale of that film to a European magazine in 1997, which he said in turn sold some 600,000 copies before a collector bought the original 16-mm reel for $1.2 million. Copies of that version are still circulating on the Internet.

“People with romantic notions have denied that it’s Marilyn Monroe, and have invented stories” to raise doubts about the film, Barsa said in his Buenos Aires office, which is lined with pictures from his days as a concert promoter. “This film shows the real Marilyn Monroe — it was only later that the studios discovered her and transformed her.”

The face of the woman in the film looks considerably different from the Monroe who emerged later as a star, but more similar to the Monroe seen in one of her first movies, 1949’s “Love Happy,” which shows the actress before she lost weight, added a beauty spot on her left cheek and became one of Hollywood’s most enduring stars.

Barsa said he has no idea how the two original copies ended up in the hands of the people who sought his help selling them, and he refused to identify any of the principals involved. He said that in the 1940s, sex films were often made using side-by-side 16-mm and 8-mm cameras, since audiences used both formats.

The collector said that Mark Roesler of Indianapolis-based CMG Worldwide, which has managed the image and estate of Monroe, threatened to sue after the earlier version surfaced in 1997. Barsa said nothing ever came of it after the owners offered to sell the film to CMG.

Barsa is auctioning the film himself Aug. 7 at a memorabilia collectors fair that he has organized in Buenos Aires, and is hoping for publicity similar to the scandal he generated when he screened the 16-mm version at a similar fair in Madrid in 1997. News coverage of his auction is already creating another buzz on the Internet.

His part of the deal is a 10 percent sales commission, he said.

A variety of sexually explicit films and pictures have been attributed to Monroe over the years, fostering a long and unresolved debate.

“In the Marilyn community, people have debated this for years and years and for the most part it’s widely believed that this is not her,” Fortner said.

Still, even Fortner said Monroe’s image changed considerably as she became a star — that she had some plastic surgery, learned how to hold her face differently in modeling school and adopted a mole on her left cheek. “I actually think it moved from time to time,” Fortner said.